package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.ByteUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.conditions.query.LambdaQueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 发送手机验证码并保存
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1. 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //不符合条件，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //符合条件，生成验证码
        String code = RandomUtil.randomNumbers(6);
        // 2. 保存验证码到Redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        // 3. 发送验证码
        // TODO 实现发送验证码的功能
        log.debug("发送短信验证码成功，验证码：{}",code);

        // 4. 返回结果
        return Result.ok();
    }

    /**
     * 登录功能
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //不符合条件，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //校验验证码
        String code = loginForm.getCode();
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (code == null || !code.equals(cacheCode)) {
            //不一致，报错
            return Result.fail("验证码错误");
        }
        //一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //判断用户是否存在
        if (user == null) {
            //不存在，创建新用户并保存(注册）
            user = createUserWithPhone(phone);
        }
        //保存用户信息到redis
        //随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //防止重要信息泄露，先转为UserDTO，再将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回结果
        return Result.ok(token);
    }

    //创建用户并保存
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        //随机生成昵称
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //保存并返回
        save(user);
        return user;
    }

    @Override
    public Result sign() {
        //获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        //获取当前时间
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //看现在是这个月第几天
        int dayOfMonth = now.getDayOfMonth();
        //拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        //获取当前时间
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //看现在是这个月第几天
        int dayOfMonth = now.getDayOfMonth();
        //拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取这个月的签到记录，返回一个十进制数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        //非空判断
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        //获取这个月的签到记录
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        int count = 0;
        //循环遍历//和1做&运算//判断是否为1
        while (true){
            if ((num & 1)==0) {
                //不是1，跳出循环
                break;
            }else {
                //如果是1，count++
                count++;
            }
            //右移1位
            num >>= 1;
        }
        return Result.ok(count);
    }
}
